I recently got my synaptics touchpad working (in much less time than I though it would take) . However, when the synaptics touchpad started working, the wheel on my usb mouse stopped working. However, I fixed it and I'm posting here in case someone else needs to know.

Make sure that you have one input device specified for each mouse, heres what I have

Strange but I get that problem with newer kernels (2.6.15.xxx). It looks like unloading/reloading module evdev should fix it. I'll try and post my feedback._________________Gentoo addict: tomorrow I quit, I promise!... Just one more emerge...
GNU/Linux user #369763

Got it. A workaround is to compile evdev as a module and load it with /etc/modules.autoload.d/kernel-2.6. Now I've got /dev/input/event[0-4] and the touchpad scroll works._________________Gentoo addict: tomorrow I quit, I promise!... Just one more emerge...
GNU/Linux user #369763